There are three free concerts at the Sparrenburg, Wednesdays on 8 p.m.
June 12th Manfred Maurenbrecher & band
July 10th Zélia Fonseca & band
August 21st: Sabrina Ascaciba & band
(In event of rain they move to Bunker Ulmenwall – tram stop Landgericht).

Nine free puppet theatre performances (by Teutoburger Puppenbühne ) outside the Meierhof cafe Tierpark Olderdissen on Saturdays at 4 p.m from 15th June to 1oth August (for about half an hour):

Thanks PollyEster for the tips!